#include <iostream>
using namespace std;

// 函数声明
double getAverage(int arr[], int size) {
    int    i, sum = 0;
    double avg;

    for (i = 0; i < size; ++i)
    {
        sum += arr[i];
    }

    avg = double(sum) / size;

    return avg;
}

int main () {
    // 带有 5 个元素的整型数组
    int balance[5] = {1000, 2, 3, 17, 50};
    double avg;

    // 传递一个指向数组的指针作为参数
    avg = getAverage(balance, 5 ) ;

    // 输出返回值
    cout << "平均值是：" << avg << endl;

    return 0;
}